Ch 03 - Electricity: Circuits and their Components7th Science
Definition of Electricity
How is electricity fundamentally defined in physics, and what are its two primary practical requirements to function?
How is electricity fundamentally defined in physics, and what are its two primary practical requirements to function?
Electricity is a form of energy resulting from the flow of electric charge (electrons). It powers modern technology by converting electrical energy into light, heat, or mechanical energy.
Practical Requirements:
- A power source (like an electric cell or generator) to provide energy.
- A continuous conducting path (a closed circuit) for the charge to flow through.
Prism Memory Hook
A premium mnemonic for this topic is available in the Prism App.
The Electric Cell
What is the primary function of an electric cell, and how are its two electrical terminals physically distinguished?
What is the primary function of an electric cell, and how are its two electrical terminals physically distinguished?
An electric cell is a portable source that converts stored chemical energy into electrical energy.
Terminals:
- Positive Terminal (+): Structurally indicated by a protruding metal cap.
- Negative Terminal (-): Structurally indicated by a flat metal disc.
(Note: Single cells provide low voltage suitable for basic electronics like clocks and remote controls).
Prism Memory Hook
Cap is Positive (CaP), Disc is Negative.
Energy Conversion in Cells
What specific energy transformation drives the generation of an electric current inside a dry cell?
What specific energy transformation drives the generation of an electric current inside a dry cell?
Inside an electric cell, Chemical Energy is converted into Electrical Energy.
The reactive chemicals housed inside generate a potential difference (voltage), which exerts a physical force that pushes electric charges through an external connected circuit.
Prism Memory Hook
Chemicals inside -> Electricity outside.
Also in this chapter
25 more cards to study in Prism
- 4Classifications of Electric Cells
- 5Battery Formation & Series Connection
- 6Cell vs. Battery Terminology
- 7The Electric Circuit
- 8Direction of Conventional Current
- 9Utility of Schematic Circuit Diagrams
- 10Schematic Symbols: Cell & Battery
- 11The Electric Switch Mechanism
- 12Electrical Conductors vs. Insulators
- 13The Conduction Tester
- 14Material Selection: Copper Wiring
- 15Anatomy of an Electrical Wire
- 16Incandescent Lamp & Filament
- 17The Glass Bulb Enclosure
- 18The 'Fused' Bulb Phenomenon
- 19Incandescent vs. LED Technology
- 20LED Polarity and Connection
- 21LED Schematic Symbol
- 22Voltage Requirements for LEDs
- 23Series Circuit Vulnerability
- 24Short Circuit Hazards
- 25Diagnostic Checklist: Inactive Circuit
- 26Bypassing a Faulty Switch
- 27Electrical Safety & Skin Resistance
- 28Solar Cells (Photovoltaics)
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